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IV85849 which is a document APAR. The "legacy" functionality was changed in FP004 onwards.

This was the APAR that changed, and it was specific to a date/time format:

USERS AFFECTED: ALL IMPACT USERS PROBLEM DESCRIPTION: Default RExtract functionality changes in 7.1.0.3 with updated Regex Libraries. RECOMMENDATION: This APAR will add a 3rd parameter for RExtract. Similar to RExtractAll the default for the Flag, will produce the legacy behaviour. The default/true will produce the current 710 behaviour: In the case of many matches, return the last one. For legacy behaviour, set the parameter to False : In the case of many matches, return the first one.